.topic {
    width: 15%;
    height: 930px;
    float: left;
}

.topic_detail {
    width: 15%;
    height: 930px;
    float: left;
}

body{ margin:0; height:100%}
.editor {
    float: right;
    width: 70%;
    height: 930px;
}

.topic_detail_input {
    float: right;
    width: 70%;
    height: 70px;
}

.topic_detail_input input{
    width: 90%;
    height: 70px;
}

.topic_create {
    height: 30px;
    background-color: khaki;
}

.topic_item {
    height: 50px;
    background-color: aliceblue;
}

.topic_item_create {
    height: 50px;
    background-color: beige;
}

.blog_item {
     height: 50px;
     background-color: grey;
}